Deferred Compensation Arrangement, Matching Contribution, Percentage

No definition available.

Name:	bas_DeferredCompensationArrangementMatchingContributionPercentage
Namespace Prefix:	bas_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred compensation arrangement maximum matching contributions

+ References

No definition available.

+ Details

Name:	bas_DeferredCompensationArrangementMaximumMatchingContributions
Namespace Prefix:	bas_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Deferred compensation arrangement percentage of cash bonuses the employees may defer

+ References

No definition available.

+ Details

Name:	bas_DeferredCompensationArrangementPercentageOfCashBonusesEmployeesMayDefer
Namespace Prefix:	bas_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred compensation arrangement percentage of salary the employees may defer

+ References

No definition available.

+ Details

Name:	bas_DeferredCompensationArrangementPercentageOfSalaryEmployeesMayDefer
Namespace Prefix:	bas_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Defined Contribution Plan Employer Matching Contribution Vesting Period

+ References

No definition available.

+ Details

Name:	bas_DefinedContributionPlanEmployerMatchingContributionVestingPeriod
Namespace Prefix:	bas_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis=bas_FirstThreePercentOfParticipantSDeferredPayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis=bas_NextTwoPercentOfParticipantSDeferredPayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Deferred Compensation Plan - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2005	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Maximum salary deferral percentage	50.00%
Maximum cash bonus deferral percentage	100.00%
Maximum matching contributions per year	$ 10,000
Employer matching contributions and earnings, vesting schedule	5 years
Employer contributions to deferred compensation plan		$ 1,100,000	$ 500,000	$ 200,000
First 3% Of The Participant's Deferred Pay
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Matching contributions	100.00%
Matching contribution of gross pay	3.00%
Next 2% Of The Participant's Deferred Pay
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Matching contributions	50.00%
Matching contribution of deferred pay	2.00%